Updating trunk VERSION from 3806.0 to 3807.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=benmason@chromium.org

Change-Id: I49ef7868dfc7aedf4ad44ecf26dd9ef5884fdb91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632552Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663770}

chrome/VERSION

 MAJOR=76
 MINOR=0
-BUILD=3806
+BUILD=3807
 PATCH=0